Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
On the other hand it was said in the circles of the debtors, that the suffering multitude could not be relieved otherwise than by "new account-books," that is, by legally cancelling the claims of all creditors against all debtors. Matters stood again exactly as they had stood during the strife of the orders; once more the capitalists in league with the prejudiced aristocracy made war against, and prosecuted, the oppressed multitude and the middle party which advised a modification of the rigour of the law; once more Rome stood on the verge of that abyss into which the despairing debtor drags his creditor along with him.
Only, since that time the simple civil and moral organization of a great agricultural city had been succeeded by the social antagonisms of a capital of many nations, and by that demoralization in which the prince and the beggar meet; now all incongruities had come to be on a broader, more abrupt, and fearfully grander scale. When the Social war brought all the political and social elements fermenting among the citizens into collision with each other, it laid the foundation for a new resolution. An accident led to its outbreak.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=57